Add Python class for mgp_edge

Reviewers: teon.banek, ipaljak, mferencevic

Reviewed By: teon.banek

Subscribers: pullbot

Differential Revision: https://phabricator.memgraph.io/D2679

include/mg_procedure.h

@@ -538,6 +538,9 @@ struct mgp_edge *mgp_edge_copy(const struct mgp_edge *e,
 /// Free the memory used by a mgp_edge.
 void mgp_edge_destroy(struct mgp_edge *e);
 
+/// Return non-zero if given edges are equal, otherwise 0.
+int mgp_edge_equal(const struct mgp_edge *e1, const struct mgp_edge *e2);
+
 /// Return the type of the given edge.
 struct mgp_edge_type mgp_edge_get_type(const struct mgp_edge *e);
 

include/mgp.py

@@ -63,6 +63,9 @@ Property = namedtuple('Property', ('name', 'value'))
 class Properties:
     '''A collection of properties either on a Vertex or an Edge.'''
 
+    def __init__(self, obj):
+        raise NotImplementedError()
+
     def get(self, property_name: str, default=None) -> object:
         '''Get the value of a property with the given name or return default.
 
@@ -111,10 +114,14 @@ class Properties:
 
 class EdgeType:
     '''Type of an Edge.'''
+    __slots__ = ('_name',)
+
+    def __init__(self, name):
+        self._name = name
 
     @property
     def name(self) -> str:
-        pass
+        return self._name
 
 
 class InvalidEdgeError(Exception):
@@ -129,30 +136,50 @@ class Edge:
     a query. You should not globally store an instance of an Edge. Using an
     invalid Edge instance will raise InvalidEdgeError.
     '''
+    __slots__ = ('_edge',)
+
+    def __init__(self, edge):
+        if not isinstance(edge, _mgp.Edge):
+            raise TypeError("Expected '_mgp.Edge', got '{}'".fmt(type(edge)))
+        self._edge = edge
+
+    def is_valid(self) -> bool:
+        '''Return True if `self` is in valid context and may be used.'''
+        return self._edge.is_valid()
 
     @property
     def type(self) -> EdgeType:
         '''Raise InvalidEdgeError.'''
-        pass
+        if not self.is_valid():
+            raise InvalidEdgeError()
+        return EdgeType(self._edge.get_type_name())
 
     @property
     def from_vertex(self):  # -> Vertex:
         '''Raise InvalidEdgeError.'''
-        pass
+        if not self.is_valid():
+            raise InvalidEdgeError()
+        return Vertex(self._edge.from_vertex())
 
     @property
     def to_vertex(self):  # -> Vertex:
         '''Raise InvalidEdgeError.'''
-        pass
+        if not self.is_valid():
+            raise InvalidEdgeError()
+        return Vertex(self._edge.to_vertex())
 
     @property
     def properties(self) -> Properties:
         '''Raise InvalidEdgeError.'''
-        pass
+        if not self.is_valid():
+            raise InvalidEdgeError()
+        return Properties(self._edge)
 
     def __eq__(self, other) -> bool:
         '''Raise InvalidEdgeError.'''
-        pass
+        if not self.is_valid():
+            raise InvalidEdgeError()
+        return self._edge == other._edge
 
 
 VertexId = typing.NewType('VertexId', int)

src/query/procedure/mg_procedure_impl.cpp

@@ -1122,6 +1122,10 @@ mgp_edge *mgp_edge_copy(const mgp_edge *v, mgp_memory *memory) {
 
 void mgp_edge_destroy(mgp_edge *e) { delete_mgp_object(e); }
 
+int mgp_edge_equal(const struct mgp_edge *e1, const struct mgp_edge *e2) {
+  return e1->impl == e2->impl ? 1 : 0;
+}
+
 mgp_edge_type mgp_edge_get_type(const mgp_edge *e) {
   const auto &name = e->from.graph->impl->EdgeTypeToName(e->impl.EdgeType());
   static_assert(

src/query/procedure/py_module.cpp

@@ -6,183 +6,6 @@
 
 namespace query::procedure {
 
-py::Object MgpValueToPyObject(const mgp_value &value) {
-  switch (mgp_value_get_type(&value)) {
-    case MGP_VALUE_TYPE_NULL:
-      Py_INCREF(Py_None);
-      return py::Object(Py_None);
-    case MGP_VALUE_TYPE_BOOL:
-      return py::Object(PyBool_FromLong(mgp_value_get_bool(&value)));
-    case MGP_VALUE_TYPE_INT:
-      return py::Object(PyLong_FromLongLong(mgp_value_get_int(&value)));
-    case MGP_VALUE_TYPE_DOUBLE:
-      return py::Object(PyFloat_FromDouble(mgp_value_get_double(&value)));
-    case MGP_VALUE_TYPE_STRING:
-      return py::Object(PyUnicode_FromString(mgp_value_get_string(&value)));
-    case MGP_VALUE_TYPE_LIST: {
-      const auto *list = mgp_value_get_list(&value);
-      const size_t len = mgp_list_size(list);
-      py::Object py_list(PyList_New(len));
-      CHECK(py_list);
-      for (size_t i = 0; i < len; ++i) {
-        auto elem = MgpValueToPyObject(*mgp_list_at(list, i));
-        CHECK(elem);
-        // Explicitly convert `py_list`, which is `py::Object`, via static_cast.
-        // Then the macro will cast it to `PyList *`.
-        PyList_SET_ITEM(static_cast<PyObject *>(py_list), i, elem.Steal());
-      }
-      return py_list;
-    }
-    case MGP_VALUE_TYPE_MAP: {
-      const auto *map = mgp_value_get_map(&value);
-      py::Object py_dict(PyDict_New());
-      CHECK(py_dict);
-      for (const auto &[key, val] : map->items) {
-        auto py_val = MgpValueToPyObject(val);
-        CHECK(py_val);
-        // Unlike PyList_SET_ITEM, PyDict_SetItem does not steal the value.
-        CHECK(PyDict_SetItemString(py_dict, key.c_str(), py_val) == 0);
-      }
-      return py_dict;
-    }
-    case MGP_VALUE_TYPE_VERTEX:
-    case MGP_VALUE_TYPE_EDGE:
-    case MGP_VALUE_TYPE_PATH:
-      throw utils::NotYetImplemented("MgpValueToPyObject");
-  }
-}
-
-mgp_value *PyObjectToMgpValue(PyObject *o, mgp_memory *memory) {
-  mgp_value *mgp_v{nullptr};
-
-  if (o == Py_None) {
-    mgp_v = mgp_value_make_null(memory);
-  } else if (PyBool_Check(o)) {
-    mgp_v = mgp_value_make_bool(static_cast<int>(o == Py_True), memory);
-  } else if (PyLong_Check(o)) {
-    int64_t value = PyLong_AsLong(o);
-    if (PyErr_Occurred()) {
-      PyErr_Clear();
-      throw std::overflow_error("Python integer is out of range");
-    }
-    mgp_v = mgp_value_make_int(value, memory);
-  } else if (PyFloat_Check(o)) {
-    mgp_v = mgp_value_make_double(PyFloat_AsDouble(o), memory);
-  } else if (PyUnicode_Check(o)) {
-    mgp_v = mgp_value_make_string(PyUnicode_AsUTF8(o), memory);
-  } else if (PyList_Check(o)) {
-    Py_ssize_t len = PyList_Size(o);
-    mgp_list *list = mgp_list_make_empty(len, memory);
-
-    if (!list) {
-      throw std::bad_alloc();
-    }
-
-    for (Py_ssize_t i = 0; i < len; ++i) {
-      PyObject *e = PyList_GET_ITEM(o, i);
-      mgp_value *v{nullptr};
-
-      try {
-        v = PyObjectToMgpValue(e, memory);
-      } catch (...) {
-        mgp_list_destroy(list);
-        throw;
-      }
-
-      if (!mgp_list_append(list, v)) {
-        mgp_value_destroy(v);
-        mgp_list_destroy(list);
-        throw std::bad_alloc();
-      }
-
-      mgp_value_destroy(v);
-    }
-
-    mgp_v = mgp_value_make_list(list);
-  } else if (PyTuple_Check(o)) {
-    Py_ssize_t len = PyTuple_Size(o);
-    mgp_list *list = mgp_list_make_empty(len, memory);
-
-    if (!list) {
-      throw std::bad_alloc();
-    }
-
-    for (Py_ssize_t i = 0; i < len; ++i) {
-      PyObject *e = PyTuple_GET_ITEM(o, i);
-      mgp_value *v{nullptr};
-
-      try {
-        v = PyObjectToMgpValue(e, memory);
-      } catch (...) {
-        mgp_list_destroy(list);
-        throw;
-      }
-
-      if (!mgp_list_append(list, v)) {
-        mgp_value_destroy(v);
-        mgp_list_destroy(list);
-        throw std::bad_alloc();
-      }
-
-      mgp_value_destroy(v);
-    }
-
-    mgp_v = mgp_value_make_list(list);
-  } else if (PyDict_Check(o)) {
-    mgp_map *map = mgp_map_make_empty(memory);
-
-    if (!map) {
-      throw std::bad_alloc();
-    }
-
-    PyObject *key{nullptr};
-    PyObject *value{nullptr};
-    Py_ssize_t pos{0};
-    while (PyDict_Next(o, &pos, &key, &value)) {
-      if (!PyUnicode_Check(key)) {
-        mgp_map_destroy(map);
-        throw std::invalid_argument("Dictionary keys must be strings");
-      }
-
-      const char *k = PyUnicode_AsUTF8(key);
-      mgp_value *v{nullptr};
-
-      if (!k) {
-        PyErr_Clear();
-        mgp_map_destroy(map);
-        throw std::bad_alloc();
-      }
-
-      try {
-        v = PyObjectToMgpValue(value, memory);
-      } catch (...) {
-        mgp_map_destroy(map);
-        throw;
-      }
-
-      if (!mgp_map_insert(map, k, v)) {
-        mgp_value_destroy(v);
-        mgp_map_destroy(map);
-        throw std::bad_alloc();
-      }
-
-      mgp_value_destroy(v);
-    }
-
-    mgp_v = mgp_value_make_map(map);
-  } else {
-    // TODO: Check for Vertex, Edge and Path. Throw std::invalid_argument for
-    // everything else.
-    throw utils::NotYetImplemented("PyObjectToMgpValue");
-  }
-
-  if (!mgp_v) {
-    throw std::bad_alloc();
-  }
-
-  return mgp_v;
-}
-
 // Definitions of types wrapping C API types
 //
 // These should all be in the private `_mgp` Python module, which will be used
@@ -264,7 +87,6 @@ static PyTypeObject PyVerticesIteratorType = {
     .tp_dealloc = reinterpret_cast<destructor>(PyVerticesIteratorDealloc),
 };
 
-
 PyObject *PyGraphIsValid(PyGraph *self, PyObject *Py_UNUSED(ignored)) {
   return PyBool_FromLong(!!self->graph);
 }
@@ -518,6 +340,118 @@ static PyModuleDef PyMgpModule = {
     .m_size = -1,
 };
 
+struct PyEdge {
+  PyObject_HEAD
+  mgp_edge *edge;
+  PyGraph *py_graph;
+};
+
+PyObject *PyEdgeGetTypeName(PyEdge *self, PyObject *Py_UNUSED(ignored)) {
+  CHECK(self);
+  CHECK(self->edge);
+  CHECK(self->py_graph);
+  CHECK(self->py_graph->graph);
+  return PyUnicode_FromString(mgp_edge_get_type(self->edge).name);
+}
+
+PyObject *PyEdgeFromVertex(PyEdge *self, PyObject *Py_UNUSED(ignored)) {
+  CHECK(self);
+  CHECK(self->edge);
+  CHECK(self->py_graph);
+  CHECK(self->py_graph->graph);
+  const auto *vertex = mgp_edge_get_from(self->edge);
+  CHECK(vertex);
+  // TODO: Wrap mgp_vertex_copy(vertex) into _mgp.Vertex and return it.
+  PyErr_SetString(PyExc_NotImplementedError, "from_vertex");
+  return nullptr;
+}
+
+PyObject *PyEdgeToVertex(PyEdge *self, PyObject *Py_UNUSED(ignored)) {
+  CHECK(self);
+  CHECK(self->edge);
+  CHECK(self->py_graph);
+  CHECK(self->py_graph->graph);
+  const auto *vertex = mgp_edge_get_to(self->edge);
+  CHECK(vertex);
+  // TODO: Wrap mgp_vertex_copy(vertex) into _mgp.Vertex and return it.
+  PyErr_SetString(PyExc_NotImplementedError, "to_vertex");
+  return nullptr;
+}
+
+void PyEdgeDealloc(PyEdge *self) {
+  CHECK(self->edge);
+  CHECK(self->py_graph);
+  // Avoid invoking `mgp_edge_destroy` if we are not in valid execution context.
+  // The query execution should free all memory used during execution, so we may
+  // cause a double free issue.
+  if (self->py_graph->graph) mgp_edge_destroy(self->edge);
+  Py_DECREF(self->py_graph);
+  Py_TYPE(self)->tp_free(self);
+}
+
+PyObject *PyEdgeIsValid(PyEdge *self, PyObject *Py_UNUSED(ignored)) {
+  return PyBool_FromLong(!!self->py_graph->graph);
+}
+
+static PyMethodDef PyEdgeMethods[] = {
+    {"is_valid", reinterpret_cast<PyCFunction>(PyEdgeIsValid), METH_NOARGS,
+     "Return True if Edge is in valid context and may be used."},
+    {"get_type_name", reinterpret_cast<PyCFunction>(PyEdgeGetTypeName),
+     METH_NOARGS, "Return the edge's type name."},
+    {"from_vertex", reinterpret_cast<PyCFunction>(PyEdgeFromVertex),
+     METH_NOARGS, "Return the edge's source vertex."},
+    {"to_vertex", reinterpret_cast<PyCFunction>(PyEdgeToVertex), METH_NOARGS,
+     "Return the edge's destination vertex."},
+    {nullptr}};
+
+PyObject *PyEdgeRichCompare(PyObject *self, PyObject *other, int op);
+
+static PyTypeObject PyEdgeType = {
+    PyVarObject_HEAD_INIT(nullptr, 0).tp_name = "_mgp.Edge",
+    .tp_doc = "Wraps struct mgp_edge.",
+    .tp_basicsize = sizeof(PyEdge),
+    .tp_flags = Py_TPFLAGS_DEFAULT,
+    .tp_new = PyType_GenericNew,
+    .tp_methods = PyEdgeMethods,
+    .tp_dealloc = reinterpret_cast<destructor>(PyEdgeDealloc),
+    .tp_richcompare = PyEdgeRichCompare,
+};
+
+/// Create an instance of `_mgp.Edge` class.
+///
+/// The ownership of the edge is given to the created instance and will be
+/// destroyed once the instance itself is destroyed, taking care that the
+/// execution context is still valid.
+///
+/// The created instance references an existing `_mgp.Graph` instance, which
+/// marks the execution context.
+PyObject *MakePyEdge(mgp_edge *edge, PyGraph *py_graph) {
+  CHECK(edge->GetMemoryResource() == py_graph->memory->impl);
+  auto *py_edge = PyObject_New(PyEdge, &PyEdgeType);
+  if (!py_edge) return nullptr;
+  py_edge->edge = edge;
+  py_edge->py_graph = py_graph;
+  Py_INCREF(py_graph);
+  return PyObject_Init(reinterpret_cast<PyObject *>(py_edge), &PyEdgeType);
+}
+
+PyObject *PyEdgeRichCompare(PyObject *self, PyObject *other, int op) {
+  CHECK(self);
+  CHECK(other);
+
+  if (Py_TYPE(self) != &PyEdgeType || Py_TYPE(other) != &PyEdgeType ||
+      op != Py_EQ) {
+    Py_RETURN_NOTIMPLEMENTED;
+  }
+
+  auto *e1 = reinterpret_cast<PyEdge *>(self);
+  auto *e2 = reinterpret_cast<PyEdge *>(other);
+  CHECK(e1->edge);
+  CHECK(e2->edge);
+
+  return PyBool_FromLong(mgp_edge_equal(e1->edge, e2->edge));
+}
+
 PyObject *PyInitMgpModule() {
   PyObject *mgp = PyModule_Create(&PyMgpModule);
   if (!mgp) return nullptr;
@@ -537,6 +471,7 @@ PyObject *PyInitMgpModule() {
   if (!register_type(&PyVerticesIteratorType, "VerticesIterator"))
     return nullptr;
   if (!register_type(&PyGraphType, "Graph")) return nullptr;
+  if (!register_type(&PyEdgeType, "Edge")) return nullptr;
   if (!register_type(&PyQueryProcType, "Proc")) return nullptr;
   if (!register_type(&PyQueryModuleType, "Module")) return nullptr;
   Py_INCREF(Py_None);
@@ -583,4 +518,198 @@ py::Object ReloadPyModule(PyObject *py_module, mgp_module *module_def) {
   });
 }
 
+py::Object MgpValueToPyObject(const mgp_value &value, PyGraph *py_graph) {
+  switch (mgp_value_get_type(&value)) {
+    case MGP_VALUE_TYPE_NULL:
+      Py_INCREF(Py_None);
+      return py::Object(Py_None);
+    case MGP_VALUE_TYPE_BOOL:
+      return py::Object(PyBool_FromLong(mgp_value_get_bool(&value)));
+    case MGP_VALUE_TYPE_INT:
+      return py::Object(PyLong_FromLongLong(mgp_value_get_int(&value)));
+    case MGP_VALUE_TYPE_DOUBLE:
+      return py::Object(PyFloat_FromDouble(mgp_value_get_double(&value)));
+    case MGP_VALUE_TYPE_STRING:
+      return py::Object(PyUnicode_FromString(mgp_value_get_string(&value)));
+    case MGP_VALUE_TYPE_LIST: {
+      const auto *list = mgp_value_get_list(&value);
+      const size_t len = mgp_list_size(list);
+      py::Object py_list(PyList_New(len));
+      CHECK(py_list);
+      for (size_t i = 0; i < len; ++i) {
+        auto elem = MgpValueToPyObject(*mgp_list_at(list, i), py_graph);
+        CHECK(elem);
+        // Explicitly convert `py_list`, which is `py::Object`, via static_cast.
+        // Then the macro will cast it to `PyList *`.
+        PyList_SET_ITEM(static_cast<PyObject *>(py_list), i, elem.Steal());
+      }
+      return py_list;
+    }
+    case MGP_VALUE_TYPE_MAP: {
+      const auto *map = mgp_value_get_map(&value);
+      py::Object py_dict(PyDict_New());
+      CHECK(py_dict);
+      for (const auto &[key, val] : map->items) {
+        auto py_val = MgpValueToPyObject(val, py_graph);
+        CHECK(py_val);
+        // Unlike PyList_SET_ITEM, PyDict_SetItem does not steal the value.
+        CHECK(PyDict_SetItemString(py_dict, key.c_str(), py_val) == 0);
+      }
+      return py_dict;
+    }
+    case MGP_VALUE_TYPE_VERTEX:
+      throw utils::NotYetImplemented("MgpValueToPyObject");
+    case MGP_VALUE_TYPE_EDGE: {
+      // Copy the edge and pass the ownership to the created _mgp.Edge
+      // instance.
+      auto *e = mgp_edge_copy(mgp_value_get_edge(&value), py_graph->memory);
+      if (!e) {
+        PyErr_NoMemory();
+        return py::Object();
+      }
+      return py::Object(reinterpret_cast<PyObject *>(MakePyEdge(e, py_graph)));
+    }
+    case MGP_VALUE_TYPE_PATH:
+      throw utils::NotYetImplemented("MgpValueToPyObject");
+  }
+}
+
+mgp_value *PyObjectToMgpValue(PyObject *o, mgp_memory *memory) {
+  mgp_value *mgp_v{nullptr};
+
+  if (o == Py_None) {
+    mgp_v = mgp_value_make_null(memory);
+  } else if (PyBool_Check(o)) {
+    mgp_v = mgp_value_make_bool(static_cast<int>(o == Py_True), memory);
+  } else if (PyLong_Check(o)) {
+    int64_t value = PyLong_AsLong(o);
+    if (PyErr_Occurred()) {
+      PyErr_Clear();
+      throw std::overflow_error("Python integer is out of range");
+    }
+    mgp_v = mgp_value_make_int(value, memory);
+  } else if (PyFloat_Check(o)) {
+    mgp_v = mgp_value_make_double(PyFloat_AsDouble(o), memory);
+  } else if (PyUnicode_Check(o)) {
+    mgp_v = mgp_value_make_string(PyUnicode_AsUTF8(o), memory);
+  } else if (PyList_Check(o)) {
+    Py_ssize_t len = PyList_Size(o);
+    mgp_list *list = mgp_list_make_empty(len, memory);
+
+    if (!list) {
+      throw std::bad_alloc();
+    }
+
+    for (Py_ssize_t i = 0; i < len; ++i) {
+      PyObject *e = PyList_GET_ITEM(o, i);
+      mgp_value *v{nullptr};
+
+      try {
+        v = PyObjectToMgpValue(e, memory);
+      } catch (...) {
+        mgp_list_destroy(list);
+        throw;
+      }
+
+      if (!mgp_list_append(list, v)) {
+        mgp_value_destroy(v);
+        mgp_list_destroy(list);
+        throw std::bad_alloc();
+      }
+
+      mgp_value_destroy(v);
+    }
+
+    mgp_v = mgp_value_make_list(list);
+  } else if (PyTuple_Check(o)) {
+    Py_ssize_t len = PyTuple_Size(o);
+    mgp_list *list = mgp_list_make_empty(len, memory);
+
+    if (!list) {
+      throw std::bad_alloc();
+    }
+
+    for (Py_ssize_t i = 0; i < len; ++i) {
+      PyObject *e = PyTuple_GET_ITEM(o, i);
+      mgp_value *v{nullptr};
+
+      try {
+        v = PyObjectToMgpValue(e, memory);
+      } catch (...) {
+        mgp_list_destroy(list);
+        throw;
+      }
+
+      if (!mgp_list_append(list, v)) {
+        mgp_value_destroy(v);
+        mgp_list_destroy(list);
+        throw std::bad_alloc();
+      }
+
+      mgp_value_destroy(v);
+    }
+
+    mgp_v = mgp_value_make_list(list);
+  } else if (PyDict_Check(o)) {
+    mgp_map *map = mgp_map_make_empty(memory);
+
+    if (!map) {
+      throw std::bad_alloc();
+    }
+
+    PyObject *key{nullptr};
+    PyObject *value{nullptr};
+    Py_ssize_t pos{0};
+    while (PyDict_Next(o, &pos, &key, &value)) {
+      if (!PyUnicode_Check(key)) {
+        mgp_map_destroy(map);
+        throw std::invalid_argument("Dictionary keys must be strings");
+      }
+
+      const char *k = PyUnicode_AsUTF8(key);
+      mgp_value *v{nullptr};
+
+      if (!k) {
+        PyErr_Clear();
+        mgp_map_destroy(map);
+        throw std::bad_alloc();
+      }
+
+      try {
+        v = PyObjectToMgpValue(value, memory);
+      } catch (...) {
+        mgp_map_destroy(map);
+        throw;
+      }
+
+      if (!mgp_map_insert(map, k, v)) {
+        mgp_value_destroy(v);
+        mgp_map_destroy(map);
+        throw std::bad_alloc();
+      }
+
+      mgp_value_destroy(v);
+    }
+
+    mgp_v = mgp_value_make_map(map);
+  } else if (Py_TYPE(o) == &PyEdgeType) {
+    // Copy the edge and pass the ownership to the created mgp_value.
+    auto *e = mgp_edge_copy(reinterpret_cast<PyEdge *>(o)->edge, memory);
+    if (!e) {
+      throw std::bad_alloc();
+    }
+    mgp_v = mgp_value_make_edge(e);
+  } else {
+    // TODO: Check for Vertex and Path. Throw std::invalid_argument for
+    // everything else.
+    throw utils::NotYetImplemented("PyObjectToMgpValue");
+  }
+
+  if (!mgp_v) {
+    throw std::bad_alloc();
+  }
+
+  return mgp_v;
+}
+
 }  // namespace query::procedure

src/query/procedure/py_module.hpp

@@ -11,8 +11,18 @@ struct mgp_value;
 
 namespace query::procedure {
 
-py::Object MgpValueToPyObject(const mgp_value &);
+struct PyGraph;
 
+/// Convert an `mgp_value` into a Python object, referencing the given `PyGraph`
+/// instance and using the same allocator as the graph.
+///
+/// Return a non-null `py::Object` instance on success. Otherwise, return a null
+/// `py::Object` instance and set the appropriate Python exception.
+py::Object MgpValueToPyObject(const mgp_value &value, PyGraph *py_graph);
+
+/// Convert a Python object into `mgp_value`, constructing it using the given
+/// `mgp_memory` allocator.
+///
 /// @throw std::bad_alloc
 /// @throw std::overflow_error if attempting to convert a Python integer which
 ///   too large to fit into int64_t.

tests/unit/query_procedure_py_module.cpp

@@ -27,7 +27,10 @@ TEST(PyModule, MgpValueToPyObject) {
   mgp_value_destroy(list_val);
   auto *map_val = mgp_value_make_map(map);
   auto gil = py::EnsureGIL();
-  auto py_dict = query::procedure::MgpValueToPyObject(*map_val);
+  py::Object py_graph(query::procedure::MakePyGraph(nullptr, &memory));
+  auto py_dict = query::procedure::MgpValueToPyObject(
+      *map_val, reinterpret_cast<query::procedure::PyGraph *>(
+                    static_cast<PyObject *>(py_graph)));
   mgp_value_destroy(map_val);
   // We should now have in Python:
   // {"list": [None, False, True, 42, 0.1, "some text"]}
@@ -101,12 +104,16 @@ int main(int argc, char **argv) {
   // Set program name, so Python can find its way to runtime libraries relative
   // to executable.
   Py_SetProgramName(program_name);
+  PyImport_AppendInittab("_mgp", &query::procedure::PyInitMgpModule);
   Py_InitializeEx(0 /* = initsigs */);
   PyEval_InitThreads();
   int test_result;
-  Py_BEGIN_ALLOW_THREADS;
-  test_result = RUN_ALL_TESTS();
-  Py_END_ALLOW_THREADS;
+  {
+    py::Object mgp(PyImport_ImportModule("_mgp"));
+    Py_BEGIN_ALLOW_THREADS;
+    test_result = RUN_ALL_TESTS();
+    Py_END_ALLOW_THREADS;
+  }
   // Shutdown Python
   Py_Finalize();
   PyMem_RawFree(program_name);